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Mississippi Valley-type MVT ore deposits are epigenetic carbonate-hosted Pb-Zn deposits that contain galena, sphalerite, fluorite, barite, dolomite, calcite, and quartz.

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Although they are thought to form from basinal brines, their exact origins are still unclear, partly because Durham NC dating scams the scarcity of reliable geochronological data. Rb-Sr dating of sphalerites has recently been shown to be a promising technique for the direct dating of ore minerals in MVT deposits.

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This paper reports the of a reconnaissance study of sphalerites, their fluid inclusions, and associated minerals from MVT deposits of North America. Rb-Sr isotopic analyses of K-feldspar from Immel mine preclude the possibility that the Rb-Sr data reflect feldspar find Hampshire women free.

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Sphalerites from the main ore zone of Daniel's Harbour mine, New foundland, do not form a linear isochron and open behavior of the Rb-Sr system is suspected. These are not compatible with mineralization models based on regional fluid migration Newark women dating asian men to early Tertiary Cordilleran deformation.

Sphalerites from northern Arkansas have very low Rb and Sr concentrations less than 0.

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The Rb-Sr data do not form isochrons and the sphalerites have higher 87 Sr 86 Sr ratios than expected, given their Rb Sr ratios and reasonable constraints on their ages. The sphalerites are dating Visalia CA players to contain clay inclusions; and it is likely that the Sr isotopic compositions of these sphalerites, which have very low Sr concentrations, were affected by small amounts of inherited inclusions.

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Except for sphalerite from High Point blossom date in Arkansas, SEM studies and isotope dilution trace element measurements have so far failed to identify any suitable phases other than sphalerite that might be a host for the Sr. View PDF. Access through your institution Purchase PDF. Richard Kyle 2 Thomas E Lane 3. Add to Mendeley Share.

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Abstract Mississippi Valley-type MVT ore deposits are epigenetic carbonate-hosted Pb-Zn deposits that contain galena, sphalerite, fluorite, barite, dolomite, calcite, and quartz. Recommended articles Citing articles 0.

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